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Purring Frequencies for Healing. This preset utilizes binaural beats based on the approximate range of purring frequencies of domesticated cats, 27 to 44 Hz, which researchers now say can have restorative effects on the body, particularly the healing and strengthening of bones.

From the Journal of the American Veterinary Medical Association Healing and the cat's purr - Fauna Communications Research Institute Scientists have discovered that the purring of cats is a "natural healing mechanism" that has helped inspire the myth that they have nine lives. Nine lives: wounded cats purr because it helps their bones and organs to heal Wounded cats - wild and domestic - purr because it helps their bones and organs to heal and grow stronger, say researchers who have analyzed the purring of different feline species.

This, they say, explains why cats survive falls from high buildings and why they are said to have "nine lives". Exposure to similar sound frequencies is known to improve bone density in humans.
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On Rosa Parks’ 100th Birthday, Recalling Her Rebellious Life Before and After the Montgomery Bus. This is a rush transcript.

Copy may not be in its final form. AMY GOODMAN: A hundred years ago today, civil rights pioneer Rosa Parks was born. It was February 4th, 1913. On December 1st, 1955, when she was 42 years old, she refused to give up her seat to a white man on a city bus in Montgomery, Alabama. She was arrested, convicted of violating the state’s segregation laws. We want to go to a clip of Rosa Parks, in her own words.

ROSA PARKS: I left work on my way home, December 1st, 1955, about 6:00 in the afternoon. I want to make very certain that it is understood that I had not taken a seat in the white section, as has been reported in many cases. The driver said that if I refused to leave the seat, he would have to call the police. AMY GOODMAN: That was Rosa Parks speaking in April 1956 in the midst of the Montgomery bus boycott. Rosa Parks is often described as a tired seamstress, no troublemaker.